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(NoModeL) 2Sheets-Sheet 1. R. J. SHEBHY.

PRINTING TELEGRAPH BXGHANGE SYSTEM. No. 506,272. Patented Oct. 10, 1893.-

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IL Patented Oct. 10, 1893.

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UNITED STATES PATENT OFFICE.

ROBERT J. SHEEHY, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGN- MENTS, TO WENDELL GOODWIN, OF SAME PLACE.

PRlNTlNG-TELEG RAPH EXCHANGE SYSTEM.

SPECIFICATION forming part of Letters Patent No. 506,272, dated October 10, 1893.

Application filed December 31, 1887. Renewed March 15, 1893. Serial No. 466.172. (No model.)

To all whom it may concern.-

Be it known that I, ROBERT J. SHEEHY, a citizen of the United States, residing in New York, in the county and State of New York, have invented certain new and useful Improvements in Printing-Telegraph Exchange Systems, (Oase E,) of which the following is a specification.

The invention relates to an organization of circuits and apparatus for telegraphic intercommunication and other similar purposes.

The general purpose of the invention is to provide means whereby telegraphic apparatus located at different stations may be electrically connected with each other through a central station and supplied with the necessary currents for operation over a single main such conductors may be connected togetherand supplied with the requisite currents for operation; and the instruments themselves are organized in such a manner that they may be operated by currents transmitted over the line connected therewith and upon a cessation of such currents effect impressions.

In the accompanying drawings, Figure 1 is a diagram showing the general organization of apparatus and circuits for carrying out the invention. Fig. 2 is a detail of one of the instruments.

Referring to the figures, A represents a dynamo that generates alternating electric impulses. This is here provided with an armature wound with several sets of convolutions, as shown at b,'b 17 The armature-shaft carries pairs of contact rings a, a a a, a and 01.. These pairs are connected respectively with the terminals of different bobbins or armature-coil sections so that each pair delivers to its brushes 0, c c c c c alternating electric impulses, independently of The brushes 0, c 0 &c., are connected with contact-plates d, d d d, d and d respectively of a switch-board D, by means of conductors 1, 2, 3, 4, 5, and 6. Electric indicators e, e and 6 may be included in the conductors-1, 3 and 5, respectively, for the purpose of showing whether or not currents are at any time traversing such conductors.

The plates (1', d d 860., may be placed in electrical connection, by any suitable form of switch-plugs, with any of a series of plates f, f,f ,f ,f The platef is connected, by a conductor 1, with an instrument M at the central station which will be hereinafter described. The plates f f f ,f ,'are respectively connected by the conductors 11, l2, l3 and 14 with switch points g,g g and g, of indicating devices G, G G and G At different points there are located telegraphic instruments M, M M and M similar to the instrument M, and they are connected by conductors L, L L and L with the switches h, 71. h and h of the indicating devices G, G G and G Normally the switches rest upon points electricallyconnected through suitable signaling devices I, I l and I and by means of a conductor 7, with the earth at G. When a subscriber at M for instance, desires to be connected with another subscriber of the system, a current is sent over the line L and thus through the instrument I to the earth. The operator at the central station thereupon moves the switch h to the point 9, thereby connecting the line L through the line 11 to the switch plate f. This plate may then be connected with a plate (1 and thus through the brush 0 and the corresponding section of the arma ture to the brush thenceby the way of the conductor 2 to the plate d This plate may be connected with the plate f and thence through the line 1 with the instrument M and through this instrument, by a conductor 9 with the earth at E. The instrument at M is also connected with the earth at E so that the two instruments are connected in series. After the operator has ascertained that the subscriber at M desires to be connected with a subscriber at M for instance, it is necessary only to place the plate d in connection with the plate f instead of With the plate f, and move the switch h to the point gfiwhen the two instruments M and M will be con nected with each other through the brushes c and c and either instrument may be operated by the other. If at any time it is desired to place the instrument M in circuit also, this may be done by means of a split switch-plug in a manner well understood. The indicators c, e and a will show whether any given bobbin section is being used at any time, and thus show whether the connected subscribers have finished using the line.

In case two instruments located at very distant points are to be connected with each other, it may be desired to employ currents of greater strength than are delivered from one section of the armature bobbins. In such case two or more sections may be connected in series. Thus the brushes 0 and 0 might be connected through the switch-board or otherwise, and the connections continued from the brush 0 in the same manner as formerly continued from the brush 0 The sections may be connected in multiple for quantity currents.

The construction of the instruments at M, M, M 850., which it is preferred to em,- ploy, is as follows:-Referring to Fig. 2, the line L enters at a binding post at, thence it passes by way of a conductor 10 to a switch key P. This key normally rests against a contact-point p. A conductor 11 connects this point with a lever 7' applied to an electromagnet B. This lever normally rests against a point 9" which is connected by a conductor 12, to the coils of an electro-maguet T. From this magnet the connections are continued, by a conductor 13, to a binding-post n and thence by the conductor 14 to the earth at E. The electro magnet T is employed fol-operating an escapement-lever it applied to a scapewheel u upon the shaft 10 carryingthe typewheel U. The escapement lever u is carried upon a movable section or armature t of the electro-magnet. This extends loosely within one end of the hollow core 25', to which it is pivoted. The armature 15 passes between the poles N and S of a permanent or polarized magnet V. It, therefore, alternating electric impulses traverse the coils of the magnet T the escapement-anchor will be vibrated and thus govern the movements of the typewheel.

Impressions are effected from the typewheel by means of a lever q of an electromagnet Q; this electro-magnet is included in the circuit of a local battery 0. One pole of this battery being connected with the binding post a and by a conductor 15 through the coils of the magnet Q to a contact point g. Alever Q, carrying an armature g which may surround the core-armature 25 and is applied to the pole of the hollow core 25', carries an insulated contact g which normally rests against the poin'u g, by reason of the spring 8. A conductor 10 connects this contact with a contact-spring g, which when released rests against a corresponding point The point (1 is connected by a conductor 17 with the binding-post n and thence with the remaining pole of the battery 0. It, therefore, the points 1 and g are in contact, the magnet Q will be vitalized each time the point 1 is allowed to rest against the point q. As long as alternating electric impulses continue to traverse the coils of the magnet T, however, the armature is held down and the circuit is interrupted, but upon the cessation of such impulses the circuit will be closed at the points q and Q3, and the magnet Q will thus be vitalized and an impression effected from the type-wheel.

In order to preventthe waste of the battery 0, when the instrument is not in use, a device is employed for separating the points (1 and g. This consists of a latch g which maybe caused to engage an arm g upon the lever Q, and to press the spring g back, but the moment the lever Q, is drawn downward, this latch is released and allows the points to come together, and it is only replaced by hand.

\Vhen it is desired to send a signal from this instrument to the central station, the switch key P is employed. By pressing this down, a contact 19 strikes two contactsp and f. The former of these is connected by a conductor 18 with a binding-post n and thus by a conductor 19 with one pole of a battery 0'. The other pole of this battery is connected by a conductor 20 with a binding-post n, and by a conductor 21 with the binding-postn and thus with the line L. The point p is connected by a conductor 22 with the bindingpost n connected With one pole of the battery o; the other pole of this battery being connected through the binding-post n with the conductor 15. But the conductor 15 is also connected by a conductor 24 with the binding-post n and thus with the earth atE. The closing of the key P therefore serves to connect the batteries 0 and 0' in series with their poles in the proper relation to transmit a current upon thehnC L. operate the indicating device I for instance, at the central station.

Then it is desired to transmit from the instrument a key-board V is employed. This consists of keys 1) electrically connected with the separate plates '10 of a sunflower IV. The contact arm to of the sunflower is carried upon the shaft 10 of the type-wheel, and is electrically connected through the coils of the magnet R with the binding-post 71,6, and thus with one pole of the battery 0. The other pole of this battery is connected through the binding-post n with the contact plate for all the keys 1) by means of a conductor 23. When therefore, any key is depressed and the contact arm to strikes the corresponding segment of the sunflower WV, the circuit of the battery 0' will be closed through the magnet R. This will momentarily interrupt the circuit connections of the line L, since it will draw the armature lever r away from the point r'and therefore the armature lever tof the magnet T will remain in whatever. position it chances to be at the moment, and a This current will corresponding impression will be effected from the type-wheel of the instrument, and also from the type-wheel of any correspond ing instrument connected therewith through the source of alternating electric impulses at the central station. Upon releasing the key the magnet R will be demagnetized and the connections of the line L again completed.

In case it is not desired to interrupt the main line connections, the magnet T may be shunted by the contact of the lever r with a front contact-point r which is connected by the dotted conductor with the conductor 13.

I claim as my invention 1. The combination of a series of printing telegraphic instruments, located at different points, a main line for each instrument running to a central station, two or more sources of continuous or regular electric impulses, located at the central station, for actuating said printers step by step, and means for connecting any two of said main lines through any of the sources of electric impulses, substantially as described.

2. The combination of telegraphic instruments operated by alternating currents located at different points, conductors leading therefrom to a central station, switch connections at the central station whereby any of the conductors may be connected with each other, two or more sources of alternating electric impulses and circuit-connections whereby any one of said sources may be connected in the circuit of any two of said main lines.

3. In a telegraphic system, the combination of a series of telegraphic instruments located at different points, main line conductors leading therefrom to a central station, a generator of alternating electric impulses at the central station having independent circuit connections from its armature sections whereby independent electric currents may be derived therefrom, and a switch-board or equivalent device whereby any two of said lines may be connected with each other through any ofsaid armature sections.

4. In a telegraphic instrument, an electromagnet having a hollow core, a soft iron bar extending into said core, and movable therein, a permanent magnet applied to the soft iron bar, and a supplemental armature applied to the hollow core.

5. The combination of a type-wheel, an escapement device therefor, a press lever for effecting impressions from the type-wheel, a magnet for operating the press lever, amagnet and armature for vibrating the escapement device, and a supplementary armature applied to the escapement magnet and attracted thereby while the escapement device is vibrated, and contacts and circuit-connection whereby the first-named magnet is energized when the supplementary armature moves away from its magnet.

6. The combination in a telegraphic instrument of a press magnet, a circuit therefor, an escapement magnet, its'armature electrically actuated in both directions to operate the escapement pallet, and a supplementary armature applied thereto controlling the circuit connections of the press magnet, the supplementary armature being attracted while the escapement pallet is being vibrated.

7. The combination, in a telegraphic instrument, of a recording magnet, a circuit therefor, an escapement magnet, an armature applied thereto controlling the circuit-connections of the recording magnet, and a mechanical circuit-interrupting device for the recording magnet released upon the movement of the armature applied to the escapement magnet.

8. The combination of a type-wheel, its-escapement device, a polarized magnet consisting of a coil and hollow iron core, a polarized iron bar or armature arranged within the hollow core and actuating the escapement lever or pallet, the press lever and its magnet, and a supplementary armature applied to the polarized escapement magnet and controlling the circuit of the press magnet, substantially as set forth.

9. In a telegraphic instrument, a signal transmitter consisting of a movable key, a battery, contact-points for the key connecting one pole of the battery with the main line and the other pole with the earth upon the operation of the key, and a second battery connected in series therewith upon the operation of the key, said second battery havinglocal connections through the press magnet of the instrument, substantiallyas described.

10. The combination with a telegraphic instrument, of a local battery and connections therefrom through the transmitting device of the instrument, a second battery and local connections therefrom through the printing,

magnet of the instrument, a circuit-controlling or signaling key, and contact points therefor whereby said batteries are coupled in series upon the operation of the key, and connections from the key with the main lines substantially as described.

11. The combination of the main line conductors, telegraphic printing apparatus connected therein and adapted to be operated by an alternating current, an alternating current electric generator having two or more bobbins sections, independent collectors for said sections, and circuit controllers adapted to connect any two printer's of the system through one or more of said sections, substantially as set forth.

In testimony whereof I have hereunto subscribed my name this 30th-day of December, A. D. 1887.

ROBERT J. 'SH EEHY.

Witnesses:

DANL. W. EDGECOMB, CHARLES A. TERRY. 

